Semaphore_WIN32.cpp

//// Semaphore_WIN32.cpp//// $Id: //poco/1.2/Foundation/src/Semaphore_WIN32.cpp#1 $//// Library: Foundation// Package: Threading// Module: Semaphore//// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.// and Contributors.//// Permission is hereby granted, free of charge, to any person or organization// obtaining a copy of the software and accompanying documentation covered by// this license (the "Software") to use, reproduce, display, distribute,// execute, and transmit the Software, and to prepare derivative works of the// Software, and to permit third-parties to whom the Software is furnished to// do so, all subject to the following:// // The copyright notices in the Software and this entire statement, including// the above license grant, this restriction and the following disclaimer,// must be included in all copies of the Software, in whole or in part, and// all derivative works of the Software, unless such copies or derivative// works are solely in the form of machine-executable object code generated by// a source language processor.// // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER// DEALINGS IN THE SOFTWARE.//#include "Poco/Semaphore_WIN32.h"namespace Poco {
SemaphoreImpl::SemaphoreImpl(int n, int max)
{
poco_assert (n >= 0 && max > 0 && n <= max);
_sema = CreateSemaphore(NULL, n, max, NULL);
if (!_sema)
{
throw SystemException("cannot create semaphore");
}
}
SemaphoreImpl::~SemaphoreImpl()
{
CloseHandle(_sema);
}
void SemaphoreImpl::waitImpl()
{
switch (WaitForSingleObject(_sema, INFINITE))
{
case WAIT_OBJECT_0:
return;
default:
throw SystemException("wait for semaphore failed");
}
}
bool SemaphoreImpl::waitImpl(long milliseconds)
{
switch (WaitForSingleObject(_sema, milliseconds + 1))
{
case WAIT_TIMEOUT:
returnfalse;
case WAIT_OBJECT_0:
returntrue;
default:
throw SystemException("wait for semaphore failed");
}
}
} // namespace Poco